Bender



March 25, 1930. A. J. NowAKowsKl 1,751,492

BENDER Filed Oct. I5, 1927 Patented Mar. 25, 1930 ALBERT J. NOWAKOWSKI, on TOLEDO, OHIO, 'Assielvoitlio v TOLEDO sTEnLTUBE COMPANY, on TOLEDO, oH1o,.aconr,onnTioi\pon onion?, f

Application inea catcher 391927.* @harina-$223,622.

scale, of thefdevice as incorporated in thel punch press of Fig. 1;

Fig. 4 is a fragmentary plan view of the device of Fig. 2 in bend effected position;

Fig. is a detail view on the line V-V, Fig. 4, looking into the clamp; and

Fig. 6 is a section on the line VI--VI, F ig. 4. l

Punch press 1 is shown as having bed plate 2, trip treadle 3 operable for eecting a cycle of reciprocation of crosshead 4. This crosshead 4 has fixed therewith depending stem 5 carrying cam face 6. This cam face 6 passes by way of guide 7 to engage complementary cam or wedge face 8, for shifting such later-` ally of the travel of this stem 5 and against the resistance of springs 9. Fixed with the cam 5 is clamp block 10 having engaging teeth 'or gripping jaw 11. This clamp 10 is provided with openings 12in which guide pins 13, as ixed with main block 14, may slide. This main block 14 is anchored by bolts 15 with the Vbed plate 2 andprovides an inner die face 16 herein shown as abend-ing arc face of a constant radius from axis 17. This block or fixed die memberprovides bearingV l18 coaxial with, the axis 17. In this bearing 18 is mounted stem 19 having fixed there- 'with by keys 20, a pair of arms 21, 22, extending in'a common direction from the stem' 19.

These arms 21, 22, each has a radially extending slot 23 through which may extend bolts 24, 25, for clamp plates 26 therewith. The bolt has anti-friction rollers 27 thereon as a mounting for roller 28 backing shoe 29 as outer opposing die member yieldably drawn by springs 30 into position between the Yarms21, 22,?V orengagement with the alfoller28.-

' ,f y Y Fixed with the crosshead 4 is'internally ythreadedactuator.31'in alignmentv with externallythreadedl stemf32 asthe upperfportionjotthe stem v19. The threads on thenut 31 are in positi'ongfor registry with the .threads 32 Aof the stern 19 Aas the crosshead 4 descendstoward the bed plate `2. In this initial descent toward this registering` positi0n,,the` stem 5 has haditscam approachto effect-gripping action ot the clamp 10 upon .articleY of work as positioned against fixed Ystop 34.v -The continued descent of thecrosshead4, asftripped-ffor operation by the treadle 3, causes a rotation'of the stem 19 with its arms 211, 22, linfthe bearing 18 relatively to the inner die v16thus causingthe shoe 29 to ride away'frOmthe-clam'pl@ and by continudesired arc extent as determinedinfthesetytingoperation andthe vradius. as determined g Y 1,7.';1,49.zfA

by the dief16. The continued cycle of operal tion of the crosshead 4 is upward away from 4thetable 2,e`iiectingffirst a swinging of the arms-21, 22, baclr to initial position with'the shoe. 29 adjacent the clamp y10 at'which position the armsk are Yyieldably lheldbyspring plunger;S-riding into seatf36 fixed with the n,

bed plate 2.l The springs 30 yieldably reset .this shoe,` 2,9,- while they springs V9 retract the Y lclarnp-10, .an`d.rthe device isaccordingly in position for withdrawal of the bent.v pipe 33 andinsertion of anotherpipefor arepetition of this cycle ofoperations'. l f `What is claimedand it isdesired to secure by United StatesLetters Patent-isz-g-f i 1. A bending machineembodying-an inner die; jhaving Yan arc seat, ,-an'j-outer relatively movable shoe, a .pair of radiallyextending armsembracing the dieand mounting the `shoe, a clamp for positioning the'stock toV be bent with the inner die at one point, and an actuator forv rendering kthe clamp effective and for additionally eiiecting through `the arms the relative shifting of the shoe as to the inner die.

2. .A bending machine embodying an inner die ,having are seat an outer relatively i199 65 L-...i3 if movable shoe, a pair of radially extending arms embracing the die and mounting the shoe, a clamp for gripping the stock to be bent With a portion of the inner die, and an actuator for rendering the clamp effective and for additionally effecting through the arms relative swinging of the shoe from said clamp along said inner die. y

3. A bending machine embodying an inner die having an arc seat of common radial eX- tent from a center, an outer relatively movable shoe having bearing at said center and a stem therefrom, a clamp for positioning the stock to be bent With the inner die at one point, and an actuator reciprocable axially of said center for effecting relat-ive swinging of the shoe from said clamp along said inner die.

l 4. A bending machine embodying an inner die having an arc seat of common radial eX- tent from a center, an outer relatively movable shoe having bearing at said center and a threaded stem therefrom, a clamp Vfor posiing the stock to be bent with the inner die at one point, and a complementary threaded plunger reciprocable to oscillate said stem.

' 5. A bending machine embodying an inner die having an arc seat of common radial eX- tent from a center, an outer relatively movable shoe having bearing at said center and a threaded stem therefrom, a clamp for positioningv the stock to .be bent With the inner die at one point, and a complementary threaded plunger reciprocable toward' and upon said stem to set said-*clamp and swing said shoe and away/from said stem to reset said shoe and release said clamp.`

6. A bendingmachine embodying an inner die having a seat of the desired contour, an outer relatively movable shoe, an arm for the shoe, a clamp for positioning the stock tobe bent With-the inner die at one point, and an 'actuator for effecting the relative shifting of the shoe as directed by said arm and additionf ally'having a Wedge therefrom for seating the clamp.

Y 7; A bending machine embodying an inner die having a seat of the desired contour, an

outer relatively movable shoe, an arm for the slioe, an anti-friction roller carried by the arm for engaging the shoe, a shiftable mounting permitting release of the shoe, a catch for holding the shoe adjacent the clamp against release, and a trip for the catch.

v In Witness vwhereof I aflix my signature.

ALBERT J. NOWAKOWSKI. 

